#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>

int main(){
    pid_t pid1, pid2, pid3;
    pid1 = fork();
    pid2 = fork();
    pid3 = fork();

    if((pid1 == -1) || (pid2 == -1) || (pid3 == -1)){
        printf("Error %d %s\n", errno, strerror(errno));
        exit(EXIT_FAILURE);
    }
    puts("Sleep");
    sleep(20);
    exit(EXIT_SUCCESS);
}